Lifting-jack.



J. B. TAYLOR.

LIPTING JACK.

APPLIOAIION FILED NOV. 23, 1909.

Patehted Mar. 14., 191i.

W/nesses.

To all whom it may concernf Y e Be it known that I, JOTHAM B. TAYLOR;

:of Auburn, in the county of Cayuga, in the State of New. York, haveinvented new and useful Improvements in Lifting-Jacks, of

.-which the following, taken in connection ator may stan with theaccompanying drawings, isn .full,

T-his invention relates tocertain im'- provements in lifting'jacksofthetelescopmg. screw type adapted more particularly; for automobile usesfforjengilging on-or'ithe, y other ofth'e axles to lift the wheels fromthe" ground in removing or replacing the tires. In this specific use thejack and its operet "mem -mg,

openin' or. present y'described.

"A. vertica ly movable intermediate tube is provided with an externalleft 1- I UNI TED ST PATENT 1 I- Jo'rimnr B. TAYLOR; on nunumniinwi'onki i I Specificetionotlettersi'tent.. i f at tented Mar.) 1911. Igpplication filed November ee 909." nossz gmsi;

guideiwaf ei piirpose. i

hand thread 7 extending from. its lower I end upwardlythrouglioutj'the'. greater port v having "it smooth cylinricaliperiphery and an nitern lghr t ing means. is necessarily placedlow fdown' and operates in. a limited space and I -ha've. i; V foundthat the "vertical. movement- (lithe p operating-member is-moreefiectivea'ndaid vantageous owin to the'fact that the opergreater powerby direct downward. pressure upon the lever in operating'the screw. 1

My object therefore is to operate the-jack by means of 9. verticallymovable lever through the medium of a 'ratchet and pawl notion wholly atone side and eccentric to the axis of the telescoping screws, so thatthe lever may have free vertical play at one side of such screws andits. supporting base through an arc of at least-90.

I Other objects and uses relating'to specific parts of the mechanismwill brought out .m-the following description.

In the. drawingsF1gu-re 1 is aside'elevation of a lifting jackenibodyiiig the vari- 'ous 'features-ofmy invention. ig -2 is a 4central vertical-sectionionline 2- '-2,- Fig. 1 Fig. 3 is-a top planofthe sanieja ck; the handle of the lever being broken away. ig-.,

4 is a. frontelehation of the upper portion of-e.- modified form of jockinwhich the teeth of the ratchet wheel mesh directly with 'thegear onthe tubular screw;

In carrying out the objects staltedjan'u'pright tubular base .l isprovided with a reduced upper end threaded internally, at

-2 endof somewhat smaller'j inner 'diemeter than the remaining lowerportion oi the internal chamber as '3, said tubular base being providedwith a laterally projecting upright-rib -4-- harving a vertical moreerect and .obtainv ve mlingionennu .ing upon" the to while the ldwer" atfseen in i andcoll Engaged with the 501 hand gthreaded portion cylndrical itslength, the u per end ofs'gtid tube 3 which is threaded fromits lower end ,upward a 5 throughout the greater portion of itslength ofthe 5 1; W1 ,3; An axlelrest orahen'd 1 is"v provided and extends some"distance; above'the upper with an*1internal qsocket rel?? receivin :theupper; endiofi the mi of the -head% being concave jto more efiec-.tively hold'it in engagement with the axle The yoke-' 11- is providedwith laterally projecting journal bearing -+l9-'-" upon the'enlzi'rgedfportion of the bearin having a' contracted outer-end."Journaled 19 is a conibijned'ratchet .-whe'el"-'-20 an gear 21+,asshown'in FigsZI, 20ml 3,

the ratchet wlieel.- -2,0' "being in this in-J stance. of greeter'diameter-then the gear.

"headbeingtheldain placeibyga pin- +18 whichni's p'assed through'theadjacent por- 'tions' of the heed and s'crew, the u'pper face 'asthe rib -4. and has its lower end fitted with an easy sliding -fit inthe guide way .or opening, so as to hold the'yoke 11'- against turningrelatively to the base land at the same timeallowing it to movevertically as the 'screws are raised and lowered.

The portion.of thelever -22 which is journaled uponthe stud 24- is flatand held in place by a Washer 27- and cotterkey or pin 28 theintermediate portion of thedever in proximityto the peripheryof theratchet 20- is enlarged at 29- and 1s provlded with a lengthwise-socket30 and atransverse slot-'-31, the latter having a forwardly extendingoffset,

-3 2,, A sliding pawl -33= is movable in the socket 30-- against theaction of I Y the spring 34-:- shown by 'ddtted lines in Fig. 1, saidpawl being provided with :3. laterally projecting pin --35 which playsin the slot The object of this pin and slot is to permit so as to enablethelatter to o erate the the pawl to be removed or turned a half-turnratchet wheel by the movement 0 thelever with the gear 12-'therebyomitting the. extra gear 21 shown in Figs. 1, 2 and 3, 40.

in either direction.

In Fig. 4 I have shown a ratchet wheel '20- as having its teeth meshingdirectly otherwise the two devices are identical, the operation beingthe'samein both instances. For example, assuming. that'it is desired toraise the head---l6 to lift a portion of a vehicle, the pawl 33-- isturned to the position shown in the drawings with the pin 35 projectinglaterally through the otf-- set slotted portion -32- to the right of thelever, so as to bring the beveled engaging end of the pawl to' the topthereby permitting the pawl to rideover the edge of the teeth as thelever is raised without efi'ecting the operation of the ratchet wheel.When the lever.is depressed, however, the lower fiat face of the pawlengages and operates the ratchet wheel 20 and its correspond- 'ing gear-2lin the direction indicated by arrow a:, in Fig. 1, and impartsrotarymotion to thegear -'12 and tubular screw -6 in the direction indicatedby arrow 3 Fig. 3, thereby screwing both screws upwardly. It isunderstood that the screw 15 will be held against turning.

i by reason'of its engagement wit the .axle

or other part to be lifted; In 10 ering the -31- and "its oil'setportion 32-.

'head andl part supported thereon, 'i t is simply necessary to drawthe'pawl back against the action of the spring -3()- to register the pin35+ witlrthe slot'-'.31-. and then turn said pawl by meansof the pin ahalf mm whereupon the spring -30- forces thepa'wl forwardly intoengagement with the ratchet wheel and brings .thejpin into ,the oppositeofiset.32 to hold the pawl against turning, it beingfun derstood thatwhen the pawl is thus' 'ad'-.

justed the ,beveled side of its engagingend of the ratchet wheel andoperating said ratchet wheel upon the upward movement of the lever.

What I claim is:

is inverted thereby allowing a free downward movement of the leverindependently '1. In a lifting jack, a tubular base threaded internallyand providedwith a guide-way in oneside thereo ,a tubuht'r screwthreaded externally and internally. but in opposite directions the"external thread engaging the internal thread of the base an additionalscrew engaging the "interna I thread of. the tubular screwandprovided'at it's up'perendf with a lifting hea'd orrest, agear on-theupper end of-the tubular-screw, :a "collar se-'j'- curedtothe tubularscrew some distance be-' .low the gear, ayoke engaginguthe t1(11bula rno at an pro-'.

screw between-said gear an vided with a laterally projectingjournalbearing. having a contracted outerend, aguide rod on the yoke slidablyengaging-,-

with the guidewa on the base to prevent turning of the y o e,'axvertically'mov able' lever journaled on the contracted outer end ofsaid bearing, a combined gear an d'ratchet wheel mounted upon theenlarged 'end of. the bearing, said gear of less diameter than saidratchet and engagin with the gear on the upper end of the tubular screw,"and a spring-pressed pawl carried by the lever and adapted to enga etherachet for intermit tent-1y shiftin t e same whereb'y'motion is impartedto t e tubular 'screw.

2. Ina liftin jack, an upright base hav-' ing its upper end threadedinternally, a yoke some -distance abo.ve the base and provided with -ajournal opening coaxial with the threaded portion of the base, slidingconnections between the yoke and base'to prevent turning of the yoke, atubular screw. I

portion enhaving an externall threaded gaging the internal y threadedortion of 'the base and having its u per en provided with an internallythre'a' edpoi'tiqn .of'opposite pitch, said tubularlsc'rewjhaving itsupper end provided with-a gear-resting upon the to face of the yoke,'a-collar. secured to the t-u ular screw-and engagingthe lower face ofthe'yoke, said y'oke-.g i

rig provided.

with-a laterally projectingfiournal bearing having a contracted outerend, a-lever jourm Q -naledl oh th e centl'acted outer end of said o edirebti on whebahyhmotioh will be"im-. aring, a combined gear andrptchet n'wuntparted to the tubular screw. e'd upon said bearing, saidgear of less diam- In jwitness whereof I have heneunto -set etex; thansaid ratchet and meshing-with the y hand on this 18th day of November1909.

5 gem carried by the tubular screw, and a- 7 JOTHAM B. TAYLOR;sptmg-pressedpawl 'carried by the lever wltnesses: 51nd adaptedtoiengage the ratchet forrotat- H. E. Oman,

mg the same when the lever 'is, ectuated in A. L. Humnu.

